micro SD 64GB in strange read only state

If I write file on card this operation is succsesfull and I it is possible to open that file but after restarting device (Galaxy Note) or reinserting to PC is newly written file missing. I cannot delete files or format card. I have this card about 2-3 months.

Mine has gone in exact same state. I can’t add, delete, format, delete partitions or anything. Have you found a solution to this issue?

I did a factory reset on my phone and my card is doing EXACTLY the same thing.  It took quite a while for me to figure out since the file seemed to exist, but I guess it was just in memory and not on the card.  I tried several pieces of software, micro SD adapters, and memory card readers, all with the same result.

My card is in the same state, vito45, did you ever reach out to sandisk support to get a refund / rma?  What was the outcome if you did?  Anyone recommend any other microsd card brands?

Return it, because it’s defective, and suffer no more.

http://www.sandisk.com/about-sandisk/contact-us/

A.

Return it, because it’s defective, and suffer no more.

http://www.sandisk.com/about-sandisk/contact-us/

A.